sh: Support early IRQ vector map reservation for delayed controllers.

Some controllers will need to be initialized lazily due to pinmux
constraints, while others may simply have no need to be brought online if
there are no backing devices for them attached. In this case it's still
necessary to be able to reserve their hardware vector map before dynamic
IRQs get a hold of them.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

4 files changed, 29 insertions, 9 deletions

diff --git a/arch/sh/boards/mach-x3proto/setup.c b/arch/sh/boards/mach-x3proto/setup.c
index 102bf56befb4..21f1bb67248e 100644
--- a/arch/sh/boards/mach-x3proto/setup.c
+++ b/arch/sh/boards/mach-x3proto/setup.c
@@ -129,8 +129,22 @@ static struct platform_device *x3proto_devices[] __initdata = {
         &m66592_usb_peripheral_device,
 };
 
+static void __init x3proto_init_irq(void)
+{
+        plat_irq_setup_pins(IRQ_MODE_IRL3210);
+
+        /* Set ICR0.LVLMODE */
+        __raw_writel(__raw_readl(0xfe410000) | (1 << 21), 0xfe410000);
+}
+
 static int __init x3proto_devices_setup(void)
 {
+        /*
+         * IRLs are only needed for ILSEL mappings, so flip over the INTC
+         * pins at a later point to enable the GPIOs to settle.
+         */
+        x3proto_init_irq();
+
         r8a66597_usb_host_resources[1].start =
                 r8a66597_usb_host_resources[1].end = ilsel_enable(ILSEL_USBH_I);
 
@@ -145,14 +159,6 @@ static int __init x3proto_devices_setup(void)
 }
 device_initcall(x3proto_devices_setup);
 
-static void __init x3proto_init_irq(void)
-{
-        plat_irq_setup_pins(IRQ_MODE_IRL3210);
-
-        /* Set ICR0.LVLMODE */
-        __raw_writel(__raw_readl(0xfe410000) | (1 << 21), 0xfe410000);
-}
-
 static void __init x3proto_setup(char **cmdline_p)
 {
         register_smp_ops(&shx3_smp_ops);
@@ -161,5 +167,4 @@ static void __init x3proto_setup(char **cmdline_p)
 static struct sh_machine_vector mv_x3proto __initmv = {
         .mv_name                = "x3proto",
         .mv_setup               = x3proto_setup,
-        .mv_init_irq            = x3proto_init_irq,
 };
diff --git a/arch/sh/kernel/cpu/sh4a/setup-shx3.c b/arch/sh/kernel/cpu/sh4a/setup-shx3.c
index f159ea2cebc7..013f0b144489 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-shx3.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-shx3.c
@@ -478,6 +478,9 @@ void __init plat_irq_setup_pins(int mode)
 
 void __init plat_irq_setup(void)
 {
+        reserve_intc_vectors(vectors_irq, ARRAY_SIZE(vectors_irq));
+        reserve_intc_vectors(vectors_irl, ARRAY_SIZE(vectors_irl));
+
         register_intc_controller(&intc_desc);
 }
 
diff --git a/drivers/sh/intc.c b/drivers/sh/intc.c
index e91a23e5ffd8..4e01d65e5edb 100644
--- a/drivers/sh/intc.c
+++ b/drivers/sh/intc.c
@@ -1377,6 +1377,17 @@ int reserve_irq_vector(unsigned int irq)
         return ret;
 }
 
+void reserve_intc_vectors(struct intc_vect *vectors, unsigned int nr_vecs)
+{
+        unsigned long flags;
+        int i;
+
+        spin_lock_irqsave(&vector_lock, flags);
+        for (i = 0; i < nr_vecs; i++)
+                __set_bit(evt2irq(vectors[i].vect), intc_irq_map);
+        spin_unlock_irqrestore(&vector_lock, flags);
+}
+
 void reserve_irq_legacy(void)
 {
         unsigned long flags;
diff --git a/include/linux/sh_intc.h b/include/linux/sh_intc.h
index 0d6cd38e673d..bff2f286ca61 100644
--- a/include/linux/sh_intc.h
+++ b/include/linux/sh_intc.h
@@ -106,6 +106,7 @@ struct intc_desc symbol __initdata = {					\
 }
 
 int __init register_intc_controller(struct intc_desc *desc);
+void reserve_intc_vectors(struct intc_vect *vectors, unsigned int nr_vecs);
 int intc_set_priority(unsigned int irq, unsigned int prio);
 
 #ifdef CONFIG_INTC_USERIMASK